现在完成时八年级英语ppt课件.ppt
现在完成时现在完成时:have/has+过去分词过去分词 1)表表示示到到现现在在为为止止已已经经完完成成或或刚刚刚刚完完成的动作。成的动作。Now we have planted all the trees.He has just come back.2)表表示示过过去去发发生生的的动动作作,但但强强调调结结果果或或对对现在的影响。现在的影响。Have you had your supper?I have read the book twice already.在在 以以 上上 两两 种种 用用 法法 中中 常常 跟跟 already,notyet,never,just,before,ever,recently等时间继续下去的状语。等时间继续下去的状语。3)表表示示过过去去已已经经开开始始,持持续续到到现现在在,也也许许还还会会继继续续下下去去的的动动作作或或状状态态，常常与与包包括现在在内的一段时间的状语连用。括现在在内的一段时间的状语连用。He has studied English for 6 years.Mary has been busy since she came back from Hangzhou.过去分词的构成 1.直接加-ed。如：play-played2.以字母e结尾的直接加d。如：name-named3.以辅音字母加y结尾的，变y为i加ed。如：carry-carried4.重读闭音节且末尾只有一个辅音字母，双写这个辅音字母再加-ed。如：stop-stopped现现在完成在完成时时 Present perfect句型句型1.肯定句肯定句现在完成时的肯定句式是现在完成时的肯定句式是“have（has）过去分词）过去分词”。注意：该句式中的注意：该句式中的have或或has是助动词，是助动词，has用于第三用于第三人称单数，其它人称一律用人称单数，其它人称一律用have。2.疑疑问问句句现现在完成在完成时时的一般疑的一般疑问问句式是把助句式是把助动词动词have或或has提提到主到主语语之前。之前。（回答用回答用“Yes，have（has）“No，havent（hasnt）”）3.否定句否定句：现现在完成在完成时时的否定句式是的否定句式是“havent（hasnt）过过去分去分词词”。Ihaveeatenmylunch.Shehaseatenherlunch.Hehaseatenhislunch.肯定句肯定句Theyhaveeatentheirlunch.Ihavenot(havent)seenthefilm.Shehasnot(hasnt)seenthefilm.现在完成时的现在完成时的否定否定形式：形式：havenot(havent)+过去分词过去分词hasnot(hasnt)+过去分词过去分词Ihaventeatensupper.eat-eatenHehasntchangedhisidea.change-changedMe-come否定句否定句1.Ive already had dinner.I _ _ dinner _.2.He has just finished his homework.He _ _ his homework _.3.Mums cooked the dinner.Mum _ _ the dinner.4.Susans learned English at school.Susan _ _ English at school.haventhadyethasnt finishedyethasnt cookedhasnt learned把下列句子改为否定句把下列句子改为否定句Haveyoueatenyourbreakfast?现在完成时的一般疑问句形式现在完成时的一般疑问句形式Have/has提前提前+过去分词过去分词HaveyouknownSandyforalongtime?Yes,Ihave/No,Ihavent.know-knownHassheeatenanythingsince9:00a.m.Yes,shehas/No,shehasnt.eat-eaten疑问句疑问句1.Ive already had dinner.2.He has just finished his homework.3.Mums cooked the dinner.4.Susans learned English at school.Have you had dinner yet?Has he just finished his homework?Has mum cooked the dinner?Has Susan learned English at school?把下列句子改为一般疑问句把下列句子改为一般疑问句分清与一般过去时的用法分清与一般过去时的用法现在完成时属于现在时态的范围，现在完成时属于现在时态的范围，不能不能和表示过去和表示过去的时间状语连用，如的时间状语连用，如yesterday,last night,three weeks ago,in1990等等.而一般过去时只表示过去的动作或状而一般过去时只表示过去的动作或状态，和现在不发生关系。态，和现在不发生关系。eg-I have seen the film.eg-I saw the film last week.eg-He has lived here since 1993.eg-He lived here in 1993.Notes:1)have been to 与与have gone tohave been to表表示示某某人人曾曾去去过过某某地地，说说话话时人已不在某地了。时人已不在某地了。have gone to表表示示某某人人已已离离开开了了原原地地，去去了另外某地，说话时，人已不在原地。了另外某地，说话时，人已不在原地。He has been to Xian twice.他曾经去过西安两次。（已经回来了）他曾经去过西安两次。（已经回来了）You cant find him.He has gone to Xian.你找不到他。他去西安了。（没回来）你找不到他。他去西安了。（没回来）动词填空：动词填空：1._ you _(clean)the room?Yes,we_(do)that already.When _ you _(do)it?We _(do)it an hour ago.2._ he _(see)this film yet?Yes.When _ he _(see)it?He _ it last week.3.How many times _you_(come)here?Once.Havecleanedhave donediddodidHasseendidseesawhavecome4.I _(read)the novel twice.Its interesting.5.She _(go)to Pairs,hasnt she?Yes.How _ she _(go)there?She _(go)there by air.6.So far,many countries _(develop)their software programs.7.Mr Chen _(give)up smoking last year.8._ you ever _(ride)a horse?Never.9.He _(keep)the book since two days ago.have readhas gonedidgowenthave developedgaveHaveriddenhas kept1.Ive already had dinner.2.He has just finished his homework.3.Mums cooked the dinner.4.Susans learned English at school.What have you already done?What has he just done?Who has cooked the dinner?Where has Susan learned English?对划线部分提问对划线部分提问（for+表示一段时间的词组，表示一段时间的词组，since+表示过去某一时刻的词或词表示过去某一时刻的词或词组）组）谓语只可用延续性动词谓语只可用延续性动词.eg.-Ive lived here for 15 years.eg.-Ive lived here since 15 years ago(1990)选用选用for和和since填空填空:1.We havent seen each other _ a long time.2.His father has been in the factory _ 10 years ago.3.The film has been on _ 20 minutes.4.Mr Green has worked here _ he came to China.5.His grandparents have been dead _ several years.6.Its five years _ we met last timeforsinceforsinceforsince练习题练习题:1.Itsalongtimesincewe_(meet)last,isntit?2.-Iknowyou_(choose)apicturebookamongthese.-Yes,Havealookatit,please.3.Sofar,spaceshipswithoutpeople_(reach)themoonandsomeotherpartsoftheuniverse.4.Myfather_homefornearlythreeweeks.A.hasgoneawayfromB.hasleftC.hasbeenawayfromD.wentaway5.Mr.andMrs.Greenhave_inChinaforaweek.A.beenB.gotC.arrivedD.reachedmethave chosenhave reachedCAGood-bye!
